Solution for treating electrotype-molds.



ALBERT W, aaaisom or BALTIMORFL'MARYILIAND.

SOLUTION FoarR'EA'rme' ELEo rnoTYPE-MoLDs.

To allwhom "it may concermf" v Be it known that I, ALBERT WV. HAR ISON,

a-citizeii of the United States, residing at Baltimore, in. the State of Maryland, have invented certain new and useful Improvements in Solutions for Treating Electrotype-. Molds, of which. the following is a specification. j

.Myinvention relates to the preparation of electrotype-molds for the electrolytic bath and consists in .an improved composition or solution for use in such' preparation.

-' 1 The PLBSUlllbitllllOSi] universal, method of preparing electrotype molds involves much 15 time, labor and expense. 'lhe wax of which the mold is .forined is firstdusted with phite, the impression made. therein, the

hig placeslremoved'with a sharp knife and the mold placed ina machine and for a long time again dusted with graphite. After this, the process is varied somewhat the most frequently used steps involving the treatment of the dusted mold with sulfate the electrolytic bath.

of copper, iron-filin s, wood alcohol and other substances, an thorougl1ly,*washing the mold after this treatment a final preparatoi'y step prior to placing the mold in My invention dispenses with the use of the sult'a'teot' copper,'iron-filings, wood aleo' i101, and other substances" used in the old process and i the long, dirty, and expensive graphite dusting in the machine, theimold,

in the practice of my process requiring no further treatment after theoriginal' dustin impression, and triimningexcept to-light ybrush over the trimmed spaces with graphite and to treat it with my improved solution,- when it is not only 'readyfor the electrolytic but 11, but t-heetf-ect of the use of niysolution is such that the act-ion of the electrolytic bath is accelerated, and the effect greatly improved, 7

My"i'mproved solution is formed dis solving a soluble mineral salt, especially a sulfate, zlilorid, of nitrate of a mineral substance in water and mixing graphite there "-lspeciflcatioh of Letters Patent. Application filed December 7, 1906. 1 Serial No. 346,703.

ing,

Patented Oct. 27, 1908.

with, the proportions being substantially one gallon of water to a half pound, more or less, ofthe salt and one pound, more or less, of graphite, 1

ln carrying out my invention the mold, after the preliminary dusting with-graphite,

impressing, trinnning and redustingthe.

ti-immed'spaccs, which is always, done by hand with a brush, is subjected to my solution, either by sprinkling, pouring, pump.

or any approvedmeans, it only of the surface of the mold be thoroughly treated. sary, the treatment with the solution serving to coat the surface of the mold with a preparatory filin ofmetal, and the mold-is at once subjected to the electrolytic bath, the

action of which is much. quicker and more perfect than with the old methods. While I may, with moderate .uccess, use several of the class of mineral salts herein-- before mentioned, I prefer to use nitrate of sodaas possibly giving the best results.

'lhe trinuning oil, of the high spaces of the mold 'atter impressing the form tlierei'n' I being necessary to good results that every portion 60 No-furtlier preparation is necesis not absolutely essential and may, in some cases, be dispensed with, thus obviating the secondary hand dusting with cover raw places on the mold.

What I claim as new is:

graphite to 1. The hereindescribed solution for treating eleetrotype molds consisting ofnitrate ofsoda dissolved in water with' graphite added thereto, all in substantially the pro portions named. Q An improved solution for treating elee; trotype mo ds prior to siib mitting tl'iem'to theeleetrolytie bath, comprising as ts principal ingredient nitrate of soda d ssolved in .water in substantially the roportions named.

In, test mony whereof -afiix my signature, in'pi'esence of two Witnesses ALBERT WV. HARRISON. Witnesses: J l v 1 i -ANDREW S. MGNEIR,

ems; HARRISON.- 

